Try to burn a directory which some large files and a couple of small files. Total number of files < 300, which is not excessive.
Size on disk reported by Windows: 6.29GB
Size reported in the CDburnerXP (4.5.8.6795) browser window 6.09GB
The size bar at the bottom detects the BD-DL disk, hoewver the total estimated size = 53538.88MB which is far too high.
What can go wrong here ?
Please ignore my question. Turned out it was not an empty disc, this was however not clearly indicated.